- The pro is that if you dont value ecosystem services, and if they are not correctly valued by the market place, they will be misalocated. The cons is that if you do it badly you will get a wrong signal, Perrings explains. About Charles PerringsCharles Perrings was appointed Professor of Environmental Economics at Arizona State University (ASU) in August 2005. Previous appointments include Professor of Environmental Economics and Environmental Management at the University of York; Professor of Economics at the University of California, Riverside; and Director of the Biodiversity Program of the Beijer Institute, Royal Swedish Academy of Sciences, Stockholm, where he is a Fellow.
Charles Perrings co-chairs (with Shahid Naeem) the ecoSERVICES core project of Diversitas, the international program of biodiversity science.
Perrings is also engaged in a range of activities to build an international science of biodiversity and ecosystem change, including both the development of an International Mechanism for Scientific Expertise on Biodiversity (IMOSEB), and a joint initiative by the ICSU and UNESCO to follow-up the Millennium Ecosystem Assessment.